Wireless base station



FIG. 1 is a perspective view of the design for a wireless base station;

FIG. 2 is a front view of the design of FIG. 1;

FIG. 3 is a rear view of the design of FIG. 1;

FIG. 4 is a left side view of the design of FIG. 1;

FIG. 5 is a right side view of the design of FIG. 1;

FIG. 6 is a top view of the design of FIG. 1; and,

FIG. 7 is a bottom view of the design of FIG. 1. 

We claim the ornamental design for a wireless base station, as shown and described. 